public class Test2 {
    public static void main(String[] args) {
        //杨辉三角形
        int[][] arr = new int[10][];
        for (int i = 0; i < arr.length; i++) {
            arr[i] = new int[i + 1];
            for (int j = 0; j < arr[i].length; j++) {
                if (j == 0 || j == arr[i].length - 1) {
                    arr[i][j] = 1;
                }else{
                    arr[i][j] = arr[i-1][j-1] + arr[i-1][j];
                }
                System.out.print(arr[i][j] + "\t");
            }
            System.out.println();
        }
    }
}
//String[] s = new String[]{"a","b","c"};
//此写法正确，是一维数组
